Hexachlorobenzene dechlorination in constructed wetland mesocosms

Zhou, Yuanqing; Tigane, Triin; Li, Xiuzhen; Truu, Marika; Truu, Jaak; Mander, Ülo

doi:10.1016/j.watres.2012.09.030

Cited by 34 publications

(9 citation statements)

References 50 publications

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“…For instance, wetland treatment of water contaminated with low chlorinated benzenes has been investigated in several studies [94,95] and it has been shown that although the uptake of this compound by plants was <0.1% of the initial concentration, the mean removal of hexachlorobenzene (HCB) was higher in the vegetated microcosm wetlands [96]. Furthermore, the dechlorination rates of HCB were found to be higher in sediment layers with well-developed root zones [97]. In case of herbicide Smetolachlor the removal efficiency have been found to be dependent on hydraulic regime in planted subsurface flow constructed wetland being substantially lower in continuous flow operation mode compared to batch mode [98].…”

Section: Application Of Phytoremediation In Treatment Wetlandsmentioning

confidence: 99%

Phytoremediation and Plant-Assisted Bioremediation in Soil and Treatment Wetlands: A Review

Truu¹,

Truu²,

Espenberg³

et al. 2015

TOBIOTJ

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127

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Phytoremediation is a technology that is based on the combined action of plants and their associated microbial communities to degrade, remove, transform, or immobilize toxic compounds located in soils, sediments, and more recently in polluted ground water and wastewater in treatment wetlands. Phytoremediation could be used to treat different types of contaminants including petroleum hydrocarbons, chlorinated solvents, pesticides, explosives, heavy metals and radionuclides in soil and water. The advantages of phytoremediation compared to conventional techniques are lower cost, low disruptiveness to the environment, public acceptance, and potentiality to remediate various pollutants. The use of plants in conjunction with plant associated bacteria (rhizosphere or endophytic) offers greater potential for bioremediation of organic compounds, and in some cases inorganic pollutants than using plants alone in bioremediation. The implementation of treatment wetlands for phytoremediation of wastewater or polluted water originating from various sources allows removing organic and inorganic pollutants from water in an environmentally friendly and economically feasible way. Presently, different processes of phytoremediation in treatment wetlands are less studied compared to phytoremediation of polluted soils. Further research is needed to advance the understanding of the pollutant removal mechanisms in treatment wetlands with vegetation, and how based on this information to improve treatment wetland design and operational parameters to achieve more efficient treatment processes. This review covers basic processes of phytoremediation with special emphasis on rhizoremediation and plant-microbe interactions in plant–assisted biodegradation in soil and treatment wetlands.

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Section: Application Of Phytoremediation In Treatment Wetlandsmentioning

confidence: 99%

Phytoremediation and Plant-Assisted Bioremediation in Soil and Treatment Wetlands: A Review

Truu¹,

Truu²,

Espenberg³

et al. 2015

TOBIOTJ

Self Cite

127

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“…The rhizosphere of certain plant species, where the physicochemical and biological processes induced by the interaction between plants, microorganisms, the soil and pollutants take place, may be important for facilitating microbial degradation of HCB in soil (Zhou et al 2013). This approach has important implications for detoxifying or transforming the higly toxic HCB to less toxic compounds even though HCB is metabolised to several toxic dechlorination products including pentachlorobenzene (PeCB), 1,2,3,4-, 1,2,3,5-and 1,2,4,5-tetrachlorobenzene, and 1,2,3-, 1,2,4-and 1,3,5-trichlorobenzene, rather than completely metabolized (Zhou et al 2013).…”

Section: Discussionmentioning

confidence: 99%

Biodegradation of hexachlorobenzene by a constructed microbial consortium

Ding

Mao

et al. 2014

World J Microbiol Biotechnol

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A consortium comprised of an engineered Escherichia coli DH5α and a natural pentachlorophenol (PCP) degrader, Sphingobium chlorophenolicum ATCC 39723, was assembled for degradation of hexachlorobenzene (HCB), a persistent organic pollutant. The engineered E. coli strain, harbouring a gene cassette (camA (+) camB (+) camC) that encodes the F87W/Y96F/L244A/V247L mutant of cytochrome P-450cam (CYP101), oxidised HCB to PCP. The resulting PCP was then further completely degraded by ATCC 39723. The results showed that almost 40 % of 4 μM HCB was degraded by the consortium at a rate of 0.033 nmol/mg (dry weight)/h over 24 h, accompanied by transient accumulation and immediate consumption of the intermediate PCP, detected by gas chromatography. In contrast, in the consortium comprised of Pseudomonas putida PaW340 harbouring camA (+) camB (+) camC and ATCC 39723, PCP accumulated in PaW340 cells but could not be further degraded, which may be due to a permeability barrier of Pseudomonas PaW340 for PCP transportation. The strategy of bacterial co-culture may provide an alternative approach for the bioremediation of HCB contamination.

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“…Small-scale constructed wetlands remove organic load efficiently (Imfeld et al 2009;De Biase et al 2011;Agudelo et al 2012;Zhou et al 2013). Physical, chemical and biological processes interact and work in concert during attenuation of organic chemicals in wetland systems.…”

Section: Organic Contaminantsmentioning

confidence: 99%

Role of Wetlands

Dhir

2013

Phytoremediation: Role of Aquatic Plants in Environmental Clean-Up

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Hexachlorobenzene dechlorination in constructed wetland mesocosms

Cited by 34 publications

References 50 publications

Phytoremediation and Plant-Assisted Bioremediation in Soil and Treatment Wetlands: A Review

Phytoremediation and Plant-Assisted Bioremediation in Soil and Treatment Wetlands: A Review

Biodegradation of hexachlorobenzene by a constructed microbial consortium

Role of Wetlands

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